CN111979368B

CN111979368B - Process method for increasing blast furnace coke supply

Info

Publication number: CN111979368B
Application number: CN202010874268.3A
Authority: CN
Inventors: 朱应军; 周良斌; 褚博源; 黄为华
Original assignee: Baowu Group Echeng Iron and Steel Co Ltd
Current assignee: Baowu Group Echeng Iron and Steel Co Ltd
Priority date: 2020-08-27
Filing date: 2020-08-27
Publication date: 2022-04-01
Anticipated expiration: 2040-08-27
Also published as: CN111979368A

Abstract

The invention relates to a process method for increasing the coke supply of a blast furnace, which comprises the following steps: (1) counting coke pushing current and coke line data in the production process of the coke oven, and establishing a reference for process improvement; (2) analyzing the size fraction distribution of different coals, so that the coal blending amount of the size fraction below 0.5mm is kept within 10 percent; (3) changing the connection mode of the hammer heads of the pulverizer, the number of the hammer heads of the pulverizer, the length of the hammer handle and the distance between the impact plates in the coal preparation process; (4) sampling and detecting from the crusher according to the specification, respectively recording the fineness of the coal as fired, corresponding coke pushing current and coke line data, comparing the fineness with the reference data in the step (1), and selecting the fineness of the coal as fired with the coke pushing current below 210A; (5) configuring according to the improved parameters and curing the production process; according to the process method, the key equipment of the coal preparation area is adjusted, the size fraction distribution of the coal as fired is optimized, and the coke yield is greatly improved on the premise of obviously improving the coke quality.

Description

Process method for increasing blast furnace coke supply

Technical Field

The invention relates to the technical field of steelmaking processes, in particular to a process method for increasing the coke supply of a blast furnace.

Background

The coke is an indispensable raw material in the production process of blast furnace iron making, mainly plays roles in framework, carbon supply, reduction, heat supply and the like, and plays a vital role in whether the blast furnace is normally produced or not. At present, single coal is reasonably distributed, mixed and crushed mainly through a coal preparation process in coke production, and then the single coal is sent to a coke oven carbonization chamber for high-temperature coking. After the coke produced by the coke oven is screened and detected, the qualified coke is sent to a blast furnace to be used as a raw material for production.

The coke oven, as a heating furnace built by a large amount of refractory materials, has short service life and is extremely difficult to maintain and repair. Therefore, after the coke oven is put into operation for a period of time, the actual production capacity of the coke oven often cannot reach the designed capacity, so that the problem of insufficient raw materials of the blast furnace constructed in a matching way exists, and the problems of resource shortage, difficult transportation, higher price and the like of outsourced coke exist.

For example, the coke oven condition of the coke oven is greatly deteriorated due to the problems of poor early maintenance and the like in the existing manufacturers, so that the production capacity of the coke oven is suddenly reduced, and the coke supply of a blast furnace is seriously influenced. In order to ensure the production of the blast furnace, coke guarantee is often and urgently purchased from the market, the cost of outsourcing coke is about 500 yuan higher than that of self-production coke, and great fund waste is caused.

Disclosure of Invention

The invention aims to provide a process method for increasing the supply of blast furnace coke, which optimizes the size fraction distribution of coal as fired by adjusting key equipment of a coal preparation area and greatly improves the coke yield on the premise of obviously improving the coke quality.

The specific scheme of the invention is as follows: a process for increasing the coke feed to a blast furnace comprising the steps of:

(1) counting coke pushing current and coke line data in the production process of the coke oven, and establishing a reference for process improvement;

(2) the size fraction distribution of different coals is analyzed, so that the coal blending amount of the coal with the size fraction of less than 0.5mm is kept within 10%, and the hardening condition of a feed opening of a hopper of the coal car is reduced, thereby facilitating the feeding from the feed hopper;

(3) changing the connection mode of the hammer heads of the pulverizer, the number of the hammer heads of the pulverizer, the length of the hammer handle and the distance between the impact plates in the coal preparation process;

(4) sampling and detecting from the crusher according to the specification, respectively recording the fineness of the coal as fired, corresponding coke pushing current and coke line data, comparing the fineness with the reference data in the step (1), and selecting the fineness of the coal as fired with the coke pushing current below 210A;

(5) and (4) configuring according to the improved parameters in the steps (1) to (4), and curing the production process.

Furthermore, the coke pushing current in the step (2) is 190-208A, and the focal line data is 1.2-1.5 m.

Furthermore, the connection mode of the grinder hammers and the hammer handles in the step (3) is integrated, cured and connected, the number of the grinder hammers is 22-42 groups, the length of the hammer handles is 300-410 mm, and the distance between impact plates is adjusted to 6-12 cm.

This patent optimizes the size fraction distribution of coal as fired through the regional key equipment of adjustment coal preparation, is showing under the prerequisite that improves coke quality, has improved coke output by a wide margin. The problem of insufficient coke is solved quickly and efficiently by reducing the consumption of iron coke per ton and improving the coke supply of the coke oven.

The method successfully improves the coke wear resistance index M10, improves the coke productivity, successfully solves the problem of insufficient coke in the production process of the blast furnace and creates better economic and social benefits by optimizing and controlling the size distribution of the blended coal.

Detailed Description

In the following, the technical solutions of the present invention will be clearly and completely described, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", and the like indicate orientations or positional relationships, and are only used for convenience in describing the present invention or simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed or operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," and "connected" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; the connection may be direct or indirect via an intermediate medium, and may be a communication between the two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The invention relates to a process method for increasing the coke supply of a blast furnace, which comprises the following steps:

The specific modification and implementation of the invention are as follows:

1. optimizing the coal blending structure of single coal, and limiting the blending quantity of the single coal with the size fraction below 0.5mm within 10 percent;

2. the connection mode of the crushing equipment is improved, namely the original movable connection of the hammer handle and the hammer head is changed into an integrated structure;

3. replacing new spare parts of the pulverizer, and modifying the original pulverizing length (the hammer handle and the hammer head) from 530mm to 300-410 mm;

4. the hammer heads of the crusher are rearranged in an optimized mode, 42 groups are reduced to 32 and 27 groups in different arrangement modes, and the proportion of large particles in the blended coal is increased;

5. adjusting the installation number of the hammer handles in time according to the dynamic balance state of the crusher, and paying attention to the operation parameters;

6. detecting the fineness condition of the blended coal crushed by the crusher, and finely adjusting a counterattack plate of the crusher, wherein the thickness is generally 6-12 cm, so as to ensure that the fineness of the blended coal is 65-75%;

7. the new mixed coal is loaded into the coke oven, and the temperature of the coke oven is measured and adjusted in time to ensure that the coke is evenly mature. The furnace temperature needs to be properly adjusted, the waste gas circulation amount needs to be properly increased, so as to increase the height of the gas combustion flame;

8. the average value of coke pushing current of the coke oven is 190-208A, the coke line data is 1.2-1.5 m, and the coke oven is stable and smooth in production.

By optimally matching with coal crushing equipment, the yield of the single-hole carbonization chamber can be effectively improved by 1.0-1.5 t to 22 +/-0.3 t while ensuring the smooth running of the coke oven. The yield of a group of 2X 55-hole coke ovens is increased by about 5.5 ten thousand tons per year, and the purchasing cost can be saved by 2750 ten thousand yuan per year according to the calculation of 500 yuan/t of price difference between self-produced coke and outsourced coke. Under the condition that the output of the coke oven is not under pressure, the overhaul time can be increased by 25-30 min per shift, the labor intensity of workers can be effectively reduced, equipment and potential safety hazards are eliminated, the field environment is improved, and the environmental pollution degree is effectively reduced.

This patent optimizes the size fraction distribution of coal as fired through the regional key equipment of adjustment coal preparation, is showing under the prerequisite that improves coke quality, has improved coke output by a wide margin. The problem of insufficient coke is solved quickly and efficiently by reducing the consumption of iron coke per ton and improving the coke supply of the coke oven. The method successfully improves the coke abrasion resistance index M by optimizing and controlling the size distribution of the blended coal₁₀The method improves the productivity of the coke, successfully solves the problem of insufficient coke in the production process of the blast furnace, and creates better economic and social benefits.

Claims

1. A process for increasing the coke feed to a blast furnace, characterized by: the method comprises the following steps:

(1) counting coke pushing current and coke line data in the production process of the coke oven, and establishing a reference for process improvement, wherein the coke pushing current is 190-208A, and the coke line data is 1.2-1.5 m;

(2) analyzing the size fraction distribution of different coals, so that the coal blending amount of the size fraction below 0.5mm is kept within 10 percent;

(3) changing the connection mode of the pulverizer hammers, the number of the pulverizer hammers, the length of the hammer handle and the distance between the impact plates in the coal preparation process, wherein the pulverizer hammers and the hammer handle are connected in an integrated curing mode, the number of the pulverizer hammers is 22-42, the length of the hammer handle is 300-410 mm, and the distance between the impact plates is adjusted to 6-12 cm;